JPH07126735A - Wire type additive feeding device - Google Patents

Abstract

PURPOSE:To provide a wire type additive feeding device which can reduce coil-up of the wire containing the additive and is favorable to stabilize the yield of the additive. CONSTITUTION:A tank 3 holding a ladle 2 incorporated with molten steel 26 is set. A hood 4 is descended by driving a driving cylinder 13 to cover the molten steel 26 in the ladle 2 with the hood 4. The molten steel 26 is stirred by supplying argon gas from a gas plug 25. In this condition, the aluminum base first wire 64 is inserted into a first guide pipe 47 by a first wire feeder 6 and pushed out from a first lower end opening part 47i of the first guide pipe 47. The tip part of the first wire 64 is dipped into an exposing part K1 (no slag 28 zone) of the molten steel 26 to add the aluminum into the molten steel 26. The second wire 74 containing calcium silicon is dipped into the molten steel 26 by the same means to add the calcium into the molten steel 26.

Description

Detailed Description of the Invention

[0001]

The present invention relates to calcium silicon,
The present invention relates to a wire-type additive feeding device for feeding a wire containing an additive containing at least one of sulfur and aluminum as a main component to a molten metal for adjusting the components of the wire.

[0002]

2. Description of the Related Art Conventionally, there has been used a wire type additive feeding device for forming a wire containing an additive as a main component and feeding the wire to molten steel. With this type, the ladle holding the molten steel is installed in the wire station, and the wires are sequentially fed into the molten steel and the tip of the wire is immersed in the molten steel, so the contact between the wire and molten steel is improved. It is ensured that the yield of the additive material to the molten steel can be expected to be improved.

As a wire type additive feeding device of this type,
As disclosed in JP-A-60-52507,
Using a wound body in which multiple wires are wound, a pair of pinch rollers are arranged in series, the wire removed from the wound body is sandwiched by each pinch roller, and the wire is bent by driving each pinch roller to run. There is known a "pinch roll" system in which the wire is fed from its tip to the molten steel in the ladle.

[0004]

The present inventor has developed a "guide pipe system" for feeding a guide pipe through a wire, unlike the above-mentioned "pinch roll system". This has the advantage that the number of pinch rollers can be simplified or eliminated. However, in this structure, since the upper end of the guide pipe is fixed to the fixed frame that constitutes the wire station, there is a problem that the lower end opening of the guide pipe facing the molten steel tends to swing when the wire is added.

Therefore, the wire protruding from the lower end opening of the guide pipe is liable to bend above the molten metal level, and is likely to wind a so-called "tuna" above the molten metal level. Furthermore, when the lower end opening of the guide pipe is brought closer to the molten steel level,
Since the length of the guide pipe becomes longer, the swing amount of the lower end opening of the guide pipe becomes large, and the wire is easily bent above the molten metal level. Therefore, there is a limit in bringing the lower end opening close to the molten steel surface.

When the wire from the lower end opening of the guide pipe bends as described above, the wire is not well immersed in the molten steel. Therefore, there is a problem that the contact between the wire and the molten steel becomes unstable and the yield of the additive material to the molten steel is not stable. The present invention has been made in view of the above circumstances, and an object thereof is to fix the guide pipe to a lid that covers the upper side of the molten metal to suppress swinging of the lower end opening of the guide pipe during wire addition. In addition, the lower end opening can be brought as close as possible to the surface of the molten metal, thereby reducing or avoiding the wire's "tatter", thus providing a wire-type additive feed device that is advantageous for stabilizing the yield of the additive. To do.

[0007]

A wire type additive feeding device according to the present invention includes a container having an upper surface opening for holding a molten metal, a lid having a mounting portion and covering the upper surface opening of the container, and mounting of the lid. A guide pipe having a pipe hole that is fixed to the part and that penetrates the lid in the vertical direction and has a lower end opening that faces the molten metal in the container. A wire feeder which has a portion and which is detached from the winding body is inserted into the pipe hole of the guide pipe to feed the wire to the molten metal from the lower end opening of the guide pipe. To do.

A ladle can be adopted as a typical container.
Molten steel can be used as the molten metal.

[0009]

[Operation] The wire of the winding body held by the wire feeder is
By the operation of the wire feeder, it is loaded into the pipe hole of the guide pipe. The wire is fed to the molten metal from the lower end opening of the pipe hole of the guide pipe. Then, the additive material contained in the wire is dispersed in the molten metal, whereby the components of the molten metal are adjusted.

Since the guide pipe is fixed to the mounting portion of the lid that covers the metal melt of the container, the swinging of the lower end opening of the guide pipe is suppressed. Further, the lower end opening of the guide pipe can be brought closer to the level of the molten metal of the container. Therefore, the wire protruding from the lower end opening of the guide pipe easily comes into contact with the molten metal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the device according to the present invention will be described below with reference to the drawings. (Structure) The frame 1 of the wire station is installed on the floor surface F. Frame 1 is vertical column 10 and horizontal column 1
1 is provided. The frame 1 is equipped with a rotating body 12 and a drive cylinder 13.

The ladle 2 as a container has an iron skin 20 having an upper surface opening 2r and a refractory layer 21 lined with the iron skin 20.
And a square box-shaped trunnion 2 arranged on the outer surface of the iron skin 20.
2, a support shaft 23 protruding radially outward, and a porous gas plug 25 provided at the bottom. Molten steel 26 as a molten metal is held in the ladle 2. When argon gas is supplied to the above-mentioned gas plug 25 from an unillustrated argon supply device, bubbling processing is performed,
The molten steel 26 in the ladle 2 is agitated.

A refractory lining layer is laminated on the tank 3. Ladle 2 is placed in an unillustrated square groove formed in tank 3.
The ladle 2 is stored in the storage chamber 3 a of the tank 3 by fitting the trunnion 22 of. Hood 4 as a lid
Is for covering the upper surface opening 2r of the ladle 2 through a gap 40. One end 43a of the wire 43 is connected to the cylinder rod 13a of the electric or hydraulic drive cylinder 13,
The other end 43c of the wire 43 is connected to the hood 4, whereby the hood 4 is suspended so as to be able to move up and down.
When the drive cylinder 13 is driven, the hood 4 is lowered to a predetermined height position, and when the drive cylinder 13 is moved backward, the hood 4 is moved.
Rises. When stopping the hood 4 at a predetermined height position, a means for providing a stopper on the ladle 2 or the frame 1 or a means for stopping the drive cylinder 13 at a fixed position by using a limit switch or the like can be adopted.

The hood 4 has a charging pipe 46 as a mounting portion.
Is fixed. The opening pipe 46 has an opening / closing lid 46a.
It is a part where the alloy or the heat insulating material is put into the molten steel 26 by a manual work or the like with the open. The charging pipe body 46 is disposed near the gas plug 25 of the ladle 2 so as to substantially face the gas plug 25. The first guide pipe 47 has a first pipe hole 47h penetrating in the length direction, and includes a horizontal pipe portion 47x, a vertical pipe portion 47y, and an arc pipe portion 47z. The vertical pipe portion 47y of the first guide pipe 47 is fixed to the charging pipe body 46.

The second guide pipe 48 also has a second pipe hole 48h penetrating in the lengthwise direction, and a horizontal pipe portion 48x.
And a vertical pipe portion 48y and an arc pipe portion 48z. The vertical pipe portion 48y of the second guide pipe 48 is also fixed to the charging pipe body 46. The vertical pipe portion 47y of the first guide pipe 47 penetrates the hood 4 in the vertical direction,
The first lower end opening 47i of the first guide pipe 47 faces the molten metal surface 26f of the molten steel 26 in the ladle 2. Similarly, the second guide pipe 48 also penetrates the hood 4 in the vertical direction, and the second lower end opening 48i of the second guide pipe 48 faces the molten metal surface 26f of the molten steel 26 in the ladle 2. The inner diameters of the first pipe hole 47h and the second pipe hole 48h can be selected as appropriate, for example, 20 to 5
It can be set to about 0 mm.

As can be understood from FIG. 3, the hood 4 is provided with a rod-shaped positioning portion 49, and when the hood 4 is moved up and down, the positioning portion 49 is fixed to the fixed pipe 1 of the frame 1.
9 through which the lateral positioning of the hood 4 is achieved. As can be seen from FIG. 1, the hood 4 holds the tip 50 of the dust collecting tube 5. The other end 51 of the dust collecting pipe 5 is connected to the dust collecting device 55, and the dust collecting device 55
The suction is performed from the tip 50 of the dust collecting tube 5 by driving.

The frame 1 is equipped with a first wire feeder 6. As can be understood from FIG. 2, the first wire feeder 6 includes a first holding portion 60 and a first drive roller 62. A first winding body 65, in which a first wire 64 made of aluminum as an additive material is wound, is used, and the first drive roller 62 is driven while the first winding body 65 is held by the first holding portion 60. For example, the first wire 64 removed from the first winding body 65 is fed in the direction of the arrow B1 and the first guide pipe 4
7 and the first lower end opening 47 of the first guide pipe 47.
It is immersed in molten steel 26 from i. Aluminum is effective for deoxidizing and refining the structure.

Similarly, the second wire feeder 7 is attached to the frame 1.
Is also equipped. The second wire feeder 7 has basically the same configuration as the first wire feeder 6, and includes a second holding portion 70 and a second driving roller 72. The second winding body 75 is formed by winding the second wire 74 in which calcium silicon (Ca-Si) as an additive is coated with an iron layer.
When the second driving roller 72 is driven while the fifth holding member 70 holds the second holding member 70, the second wire 74 removed from the second winding body 75 is fed in the direction of the arrow C1 and the second guide pipe 48
The second lower end opening 48i of the second guide pipe 48
Is immersed in molten steel 26. Calcium is effective in improving the machinability of steel.

In the present embodiment, the outer diameters of the first wire 64 and the second wire 74 and the feeding speed thereof can be appropriately selected according to the material, yield, target composition and the like. First wire 64 or second
The outer diameter of the wire 74 can be set to, for example, about 5 to 40 mm, and the feeding speed of the first wire 64 and the second wire 74 can be set to, for example, 1 m / min to 300 m / min. (Use) Now, when using, the ladle 2 holding the molten steel 26
The tank 3 holding the above is installed in the tank installation site 1 m of the frame 1. Further drive the drive cylinder 13 to drive the hood 4.
Is lowered, and the upper surface opening 2r of the ladle 2 is covered with the hood 4 through the gap 40. In this state, as can be understood from FIG. 1, the trumpet-shaped inlet 47r of the first guide pipe 47 faces the guide 6x of the first wire feeder 6 on the frame 1. The same applies to the case of the inlet 48r of the second guide pipe 48. With the hood 4 covering the ladle 2 as described above, argon gas is supplied from the gas plug 25 at the bottom of the ladle 2 for bubbling treatment, and the molten steel 26 is stirred. In this state,
The first wire 64 is loaded into the first guide pipe 47 from the inlet 47r by the first wire feeder 6, and the first wire 64 is further projected from the first lower end opening 47i of the first guide pipe 47. The tip of 64 is immersed in molten steel 26.

Similarly, the second wire feeder 7 loads the second wire 74 into the second guide pipe 48 from its inlet,
The second wire 74 is projected from the second lower end opening 48i of the second guide pipe 48, and the tip of the second wire 74 is immersed in the molten steel 26. As a result, aluminum, which is an additive material for the first wire 64, is added to the molten steel 26, and similarly, calcium silicon, which is an additive material for the second wire 74, is added to the molten steel 26, and the composition of the molten steel 26 is adjusted. In addition, as described above, when the first wire 64 and the second wire 74 are charged, the dust collector 55 is driven and the generated harmful gas or the like is sucked.

In this embodiment, the temperature is measured by the thermocouple 91 of the temperature measuring device 90. Then, the molten steel 26 in the ladle 2 is poured into the mold with the required composition and the required temperature. In this embodiment, the target composition of the molten steel 26 is 0.1% by weight and 0.1% by weight of carbon,
Silicon is 0.1 to 0.37%, Mn is 0.15 to 0.
40%, aluminum 0.005-0.05%, sulfur 0.04-0.07%, calcium 3-200PP
M, but is not necessarily limited to this.

(Effect) As described above, in this embodiment,
Since both the first guide pipe 47 and the second guide pipe 48 are fixed to the hood 4 that covers the molten metal surface 26f, the first lower end opening 47i of the first guide pipe 47 and the second guide pipe 48 The rocking of the second lower end opening 48i can be suppressed, and the first lower end opening 47i and the second lower end opening 48i can be brought close to the molten metal surface 26f of the molten steel 26 while suppressing the rocking.

Therefore, the first wire 64 protruding from the first lower end opening 47i of the first guide pipe 47 and the second wire 7 protruding from the second lower end opening 48i of the second guide pipe 48.
The amount of bending of 4 can be reduced or avoided, and the "toguro" prevention effect is improved. Therefore, the first wire 64 is satisfactorily immersed in the molten steel 26, the contactability between the first wire 64 and the molten steel 26 is secured, and the yield of addition of the first wire 64 is improved.
Similarly, the second wire 74 is well immersed in the molten steel 26,
The contact between the second wire 74 and the molten steel 26 is secured, and the second
The yield of addition of the wires 74 is improved.

Further, in this embodiment, by driving the drive cylinder 13 to lower the hood 4 to a predetermined height position, when the ladle 2 is covered with the hood 4, as will be understood from FIG. The trumpet-shaped inlet 47r of the first guide pipe 47 fixed to the first guide pipe 47 automatically faces the guide 6x of the first wire feeder 6. Therefore, when the first wire feeder 6 is driven, the first wire 6 of the first winding body 65 is
4 can be automatically inserted into the trumpet-shaped inlet 47r, which is advantageous for automating the setting operation of the first wire 64. The same applies when the second wire 74 is inserted into the trumpet-shaped inlet 48r of the second guide pipe 48.

Since the argon gas supplied from the bottom of the ladle 2 to the molten steel 26 floats on the molten metal surface 26f, the molten metal 26 has a molten argon atmosphere on the molten metal surface 26f. Therefore, the contact between the calcium silicon-based second wire 74 and oxygen in the atmosphere is reduced or avoided, so that the reaction between calcium silicon and oxygen in the atmosphere is suppressed, and the yield of highly reactive calcium to the molten steel 26 is improved. Is even more effective.

Similarly, the contact between the first wire 64 and oxygen in the atmosphere is reduced or avoided, and the reaction between the aluminum of the first wire 64 and oxygen in the atmosphere is suppressed, which is more effective in improving the yield of aluminum. Generally, a slag 28 floats on the molten metal surface 26f of the molten steel 26 of the ladle 2. When the floating slag 28 reacts with the calcium silicon of the second wire 74 and the aluminum of the first wire 64, the calcium silicon and aluminum that should be added to the molten steel 26 are absorbed by the slag 28 and the yields thereof are impaired. There is a risk.

In this respect, in this embodiment, the first lower end opening 47i of the first guide pipe 47 and the second lower end opening 48i of the second guide pipe 48 are arranged so as to substantially face the gas plug 28 which blows out the argon gas. Therefore, the first lower end opening 47
i or the slag 28 near the second lower end opening 48i moves to another place on the molten metal surface 26f by the bubbling process of argon gas, and therefore the molten metal surface 26f of the molten steel 26 near the first lower end opening 47i or the second lower end opening 48i is It is exposed and it is easy to form the exposed portion K1. Therefore, on the molten metal surface 26f of the molten steel 26 exposed or easily exposed in this way, the first
The wire 64 and the second wire 74 from the second lower end opening 48i
Since it is soaked, it is possible to reduce or avoid the contact between the first wire 64 and the slag 28 and the contact between the second wire 74 and the slag 28. Therefore, it is more effective for improving the yield of calcium silicon addition and aluminum addition.

Furthermore, since calcium has a very high reactivity, calcium easily reacts with the dissolved oxygen in the molten steel 26 to form an oxide, in which case the yield of calcium may be reduced. In this respect, in this embodiment, the first guide pipe 47 is used.
Since both the first guide pipe 48 and the second guide pipe 48 are fixed to the charging pipe body 46 of the hood 4, the first lower end opening 47i and the second lower end opening 48i are close to each other, as can be understood from FIG. Moreover, as described above, since the swing of the first lower end opening 47i of the first guide pipe 47 and the second lower end opening 48i of the second guide pipe 48 is suppressed, the first wire 64 and the second wire 74 approach each other. It is possible to dip the molten steel 26 in position. Therefore, the amount of dissolved oxygen in the immersion place can be reduced by the aluminum that is the deoxidizer that constitutes the first wire 64, and as a result, it is advantageous to suppress the reaction of the highly reactive calcium with the dissolved oxygen of the molten steel 26. Therefore, it is advantageous for improving the calcium yield of the second wire 74.

(Other Examples) In the above example, as described above,
Although the calcium silicon type wire and the aluminum type wire are added to the molten steel 26, the present invention is not limited to this, and the sulfur type wire and the aluminum type wire are added to the molten steel 26.
It may be added to. In this case, the sulfur-based wire may be loaded into the second guide pipe 48 after the addition of the calcium-silicon-based second wire is completed.

Alternatively, in addition to the first guide pipe 47 and the second guide pipe 48, the third guide pipe is also fixed to the hood 4, and three kinds of wires of calcium silicon type, aluminum type and sulfur type are provided. It is also possible to adopt a configuration in which each of the wires is individually added to the molten steel 26. Depending on the case, a selenium-based wire, a lead-based wire, a carbon-based wire, a titanium-based wire, or a wire made of another material can be used. The target composition of the molten steel is not limited to the above-described one, and can be appropriately applied to austenitic stainless steel with improved machinability.

[0031]

According to the apparatus of the present invention, since the guide pipe is fixed to the lid that covers the surface of the molten metal, the lower end opening of the guide pipe swings as compared with the case where the upper end of the guide pipe is held. The lower end opening of the guide pipe can be brought close to the surface of the molten metal while suppressing the movement and further suppressing the swing.
Therefore, the amount of bending of the wire protruding from the lower end opening of the guide pipe can be reduced or avoided, and the effect of preventing "tuggling" is improved. Therefore, the wire is well immersed in the molten metal, the contact between the wire and the molten metal is secured, and the yield of wire addition is improved.

[Brief description of drawings]

FIG. 1 is a side view of the entire device, a part of which is shown in cross section.

FIG. 2 is a plan view of a main part.

FIG. 3 is a side view of a main part.

[Explanation of symbols]

In the figure, 2 is a ladle (container), 26 is molten steel (molten metal), 4
7 is a first guide pipe, 48 is a second guide pipe, 47i is a first lower end opening, 48i is a second lower end opening, 65 is a first winding body, 75 is a second winding body, 64 is a first wire, 74 is the second
A wire, 6 is a first wire feeder, and 7 is a second wire feeder.

Claims (1)

[Claims] 1. A container having an upper surface opening for holding a molten metal, a lid having a mounting portion and covering the upper surface opening of the container, a lid fixed to the mounting portion of the lid, and vertically penetrating the lid. A guide pipe having a pipe hole whose lower end opening faces the molten metal in the container, and a holding portion for holding a winding body wound with a wire containing an additive as a main component, and a wire removed from the winding body. And a wire feeder for feeding the wire into the molten metal from the lower end opening of the guide pipe, and a wire-type additive feeder. .